Week 4 Flashcards
Which of the following is NOT needed to perform an analysis using 3D motion capture
Force Plate
How many cameras (minimum) are needed for 3D motion capture
2
The entire biomechanics lab from wall to wall is part of the capture volume
False
In order for the cameras to all “talk” to each other, what step must be taken during calibration
A wand is waved for a period of time in the capture volume
Any place within the capture volume could be defined as the origin of the xyz coordinate system
True
How many markers (minimum) are necessary for each body segment
3
Using 3D motion capture, the pelvis angle would be measured as the angle between the trunk and the thigh segments
False
In 3D motion capture, joint angles can be calculated similar to 2D motion capture using the x-y coordinates of as few as 3 reflective markers
False
Plug-in Gait uses standardized marker placements that the 3D motion capture software can recognize and then quickly compute joint angles during walking gait
True
Which of the following has been demonstrated as a symptom of concussion using 3D motion capture
Increased medial lateral sway during walking
How many cameras minimum are needed for 3D motion capture
2
How many frames do you need to calibrate using the calibration wand
1000 frames
The calibration wand is set up at
xyz 0,0,0
What body segments define the ankle
Foot and shank
What body segments define the knee
Shank and thigh
What body segments define the hip
Pelvis and thigh
What body segments define the pelvis
Pelvis is a segment angle
What body segments define the trunk
Trunk is a segment angle
What body segments define the shoulder
Arm and scapula
What is a capture volume
The volume of space representing the coverage area of the 3D motion capture cameras within a biomechanics lab
The wand has two functions
Calibrates cameras
Defines xyz origin
3D motion capture vs 2D motion capture characteristics
3D: Accurate Repeatable 3 Planes of motion Automatic processing
2D:
Money - cheap
Time
Accessibility
How many markers in total in plug in gait method
16 markers
Which side of the body has slightly higher marker placement and what body parts are they
Right thigh
Right Tibia
Plug in gait is…
However is…
Requires…
Commonly used
Limited
1 extra step - anthropometric data
What anthropometric data does plug in gait require
Height
Weight
Leg length
Knee width
Ankle width
What can 3D motion capture be used for in real life
Animated video games
Movie characters
3D joint angles during movement
